You should reduce your speed by about _____ on a wet road. Calculate the net energy change in kilojoules per mole that takes place on formation of MgF2_22(s) from the elements: Heat of sublimation for Mg(s) = 147.7 kJ/mol Eea_{ea}ea for F(g) = -328 kJ>mol, Bond dissociation energy for F2_22(g) = 158 kJ>mol Ei1_{i1}i1 for Mg(g) = 737.7 kJ>mol, Electrostatic interactions in MgF2_22(s) = -2957 kJ/mol Ei2_{i2}i2 for Mg(g) = 1450.7 kJ/mol. You need to be aware of how parking lots are arranged in order to avoid a long and difficult escape. For emergency braking you should: May have poor traction due to bouncing and wheels lockup. You are driving a 100-feet truck with double trailers at 30 mph. The road is dry and visibility is good. 0000003060 00000 n You will have greater length and more dead axles to pull with your drive axles than other drivers. Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. 4. - Converter dolly air tank drain valve: CLOSED. For emergency braking you should: which of these statements about emergency steering is true? You are driving a 100 ft twin trailer combination at 50 mph. Chock the tires, park on level ground and charge the trailer air tank if it does Which of the following is true about loading cargo into double or triple trailers? Never pull any trailer without visually inspecting the fifth wheel locking bar Before you can supply air to the air tanks of a second trailer you need to: Open the shut-off valves at the rear of the first trailer and close the shut-off valves at the rear of second trailer. Use the dummy couplers when the air lines are not connected to a trailer. 0000002636 00000 n A. require shorter stopping distances than full ones With the red knob pushed in on the tractor dash, the service line should have air in it. recouple. Ship to Store. How do you check to make sure trailer height is correct before coupling? A converter dolly is If a converter dolly has spring brakes, you release the brakes by You have connected the converter dolly to the front semitrailer and then connected the rear semitrailer to the converter dolly. Should the shut-off valves on the trailers be open or closed on a set of double trailers? the rig will continue moving in a straight line no matter how much the steering wheel is turned. Any single vehicle with a GVWR of 26,001 or more pounds, or any such vehicle towing another not in excess of 10,000 pounds. These trailers have no parking brake. What does the drivers manual say about how much space you should keep ahead of your truck? The heavier trailer should be in the rear. B. keep other traffic out of your side space The trailer is at the correct height when. Make sure pintle hook is latched. Calculate the voltage gain of each. To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space What three methods can you use to secure a second trailer before coupling? you are driving a set of doubles and a set of trailer wheels goes in a skid. A turn of the glad hand attached to the hose will join and lock the couplers. To help avoid mistakes, colors are sometimes used. When you do this, you should hear: If you do, the brakes may not work correctly. When inspecting the air brakes on doubles and triples, you wait for air pressure to reach normal, then push in the red trailer air supply knob. [Flashing Signals, Traffic Signals, Chapter 5 - Signals, Signs and Pavement Markings, North Carolina Driver's Handbook], One component of the DUI sentence in the state of Tennessee is twenty-four hours of litter pick-up wearing clothing that says "I am a drunk driver." When you go to the rear of the last trailer, what should you do to complete this check? rear trailer. A sudden movement with the steering wheel can result in a tipping over rear trailer. They are filled by the emergency (supply) line from the tractor. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. Doubles and triples must be driven very smoothly to avoid rollover or jacknife. Open the emergency line shut-off valve at the rear of the last trailer. Refers to pulling two trailers at the same time, otherwise known as "pups" or "pup trailers" because they're only about 28 feet long. Air flows steadily and isentropically through a passage. What three methods can you use to secure a second trailer before coupling? The lighter semitrailer should be in first position behind the tractor. Any trailer with a reduced ground clearance B These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. The heaviest trailer This has the same value as the %%TIME_USED%% Variable on the Final Screen. the best way to keep brakes from getting too hot while going down long grades is to : go slow and use only light, steady pressure on the brakes, you are driving a 100ft truck with double trailers at 30mph. Becoming A Truck Driver is a dream we've all pondered at some point in our lives. To check if the converter dolly is securely coupled to the rear trailer you should: Pull gently against the pin of the second trailer. Close the emergency line shut-off valve at the rear of the trailer. Open. Air escape from the open valve B The service brakes slowly move to the fully applied position C The emergency line valve open and release air D None of the above 4. converting it into two trailers, A coupling device of three or four axles and a fifth wheel by which a semitrailer can True or False? air throughout the system. behind the shut-off valve then they need to remain open. Which of the following will occur? 0000003998 00000 n When connecting a converter dolly to a rear trailer, the trailer height must be adjusted so that it is? A B. you should avoid traveling next to others whenever possible If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen? In order to supply air to the air tanks of a second trailer, you must ______ shut-off valves at the rear of the first trailer and ________ the shut-off valves at the rear of the second trailer. Therefor, if there is a major leak in your service line, you may not know it until you try to use the service brake. [Penalties Applying to Any DUI Conviction; Driving Under the Influence of Drugs or Alcohol (The "DUI" Law); Section B-7 Alcohol, Other Drugs and Driving; Tennessee Comprehensive Driver License Manual]. Select the answer that correctly completes each statement. Before you can supply air to the air tanks of a second trailer you need to. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Newer trailers have spring brakes just like trucks and truck tractors. Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. When you uncouple twin trailers, the last step is to Converter dollies You want to hook your combination to a second trailer that has no spring brakes. You are doing a walk around inspection of a double or triple trailer rig. B Which f these will result in the best control on curves? It's a fifth wheel, not a sixth wheel. In the coupling system, the locking jaws should be fixed around? Dont hesitate to take advantage of our practice tests in each category specific to your needs. Trailer Air Tanks And Shutoff Valves - TruckingTruth B. for doubles and triples, the fifth wheel should be all the way towards the tractor However, converter dollies and trailers built before 1975 are not required to have spring brakes. D Doubles and triples are more likely to turn over than other combination vehicles because of the "crack-the-whip" effect. A) one inch of space . Calculate the Mach number at section 2. A. allow "much more space" than is needed for ideal driving conditions B. you can almost always stop more quickly than you can turn Flashcards - Doubles Tripes Test #4 - FreezingBlue C. back up slightly and make a visual check of the coupling, You are driving with double trailers and must use your brakes to avoid a crash. A low air buzzer will go off indicating something is wrong and either the front or the 0000008894 00000 n When does the Driver's manual say you should disable the steering axle brake? By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. The rear trailer of a triple HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD C Open the emergency line shut-off valve at the rear of the last trailer. When connecting two trailers the converter dolly is connected to the rear trailer first. Never unlock the pintle hook with the dolly still under the rear trailer. B. open; latched You should not hear air escaping. 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. with the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. you are driving on a slippery road during the day. 0000009577 00000 n Open, latched Release Dolly breaks by opening the air tank petcock or if the dolly has a spring break, use the Dolly parking brake control . Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? The converter dolly air tank drain valve on coupled double and triple trailers should be: When inspecting coupled doubles and triples, make sure the pintle hooks are: How can you be sure you supplied air to a second trailer? ADVERTISEMENT ADVERTISEMENT A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. If you do, there is a problem. Which of these is most likely too occur? Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. Make a sketch that explains this phenomenon in terms of a feedback loop . Shut-off valves (also called cut-out cocks) are used in the service and supply air lines at the back of trailers used to tow other trailers. This would be very dangerous. That there is no space between upper and lower fifth wheel. Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes. What should you check for when inspecting the converter dolly? re-couple, You can if you want to, it does not matter. You are doing a walk around inspection of a double or triple trailer second trailer will be connected, The dolly will have a yellow lamp on the left side, The dolly will have a yellow lamp on the right side, The dolly will have a red lamp on the left side, The dolly will have a red lamp on the right side. Slow to a safe speed before entering the curve, then coast through the curve. To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space Always unlock the pintle hook with the dolly still under the rear trailer. Go to the rear of second trailer and open the emergency line shut-of valve. during normal operation the brakes of the double/triple trailer are controlled by : which of these will result in the best control on curves? Tractor-trailers are considered combination vehicles. The emergency brakes come on whenever air pressure in the emergency line is lost. 0000001162 00000 n There is more chance for skids and loss of traction. In a certain electronic device, a three-stage amplifier is desired, whose overall voltage gain is 42 dB. For emergency braking you should: Use controlled or stab braking Converter dollies: Often do not have spring brakes The crack the whip effect that troubles trucks with trailers. The dolly tow bar may fly away, possibly causing panic, and making it very difficult Some do. You must steer gently when pulling trailers. If this lamp is illuminated and does not go out, Doubles/Triples Air Brake Check - digital.ncdcr.gov You are driving with double trailers and must use your brakes to avoid a crash. C You should keep at least _____ seconds of space ahead of you. 60607. you should not, when you turn with the tractor/triple trailer combination the wheels that offtrack(cheat) the most are. You should keep at least ____ seconds of space ahead of you. 0000001775 00000 n When driving with more than one trailer, which trailer should be the first one behind the tractor? Should the shut-off valves on the rear of the last trailer be open or closed? You may not notice a major leak in the service line until you try to put the brakes on. Take special care when pulling two and three trailers. Once that's complete, then its an easy push back and the Allow much more space than is needed for ideal driving condition. TestPermit.com provides free unofficial review materials for a variety of exams. B Question 4. Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. All ABS equipped units When you do this, you should hear: Ais escape from the open valve. Closed, free, 8. What do you check when making a visual check of coupling? If there are no dummy couplers, the glad hands can sometimes be locked together (depending on the couplings). With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. There are two types of converter dollies. some large trucks have curved (convex or spot) mirrors. 0000003240 00000 n P0420 code honda odyssey 2011 - pjigzp.wikifit.it You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________. D allow "much more space than is needed for ideal driving conditions". Try our free CDL Doubles and Triples Test Question and Answers Quiz online. driven with care to avoid losing control, Make sure the spare tire is secured, if it has one, Make sure the converter dolly air tank drain valve is closed, Make sure safety chains are secured to the trailers, All of the above. A to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. Air pressure is sent from the air tanks to the brakes by relay valves. While inspecting your converter dolly coupling, you should make sure there is _____ between the upper and lower fifth wheel. Unlock the pintle hook only if the trailer it is under is loaded, otherwise the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. Use the engine brake or speed retarder. you are visually checking the coupling of a converter dolly to the rear trailer. Why should you use chocks when parking a trailer without spring brakes? Visually check to make sure that the rear trailer is slightly lower than the center of the Describe what the trailer air supply control does. The Verge logo. 0000001107 00000 n C. closed; unlatched, Which of these will result in the best control on a curve? This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. Studying and applying oneself is the only way to successfully learn the information you need to know to pass all testing required to obtain your CDL. These valves permit closing the air lines off when another trailer is not being towed. then there is a problem with the ABS system. View the full article to see how to set cruise control correctly! 9. Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. Push the brake pedal as hard as you can and hold it there paramount to safe driving. Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash. Which of these is the correct answer? C. use stab or controlled braking, Which of these is true? Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? Secure converter gear support in raised position. Join 50,000+ users around America to get your Commercial Driver License today! how can you be sure you supplied air to a second trailer? Any trailer, 7. 0000004668 00000 n Open the shut-off valves at the rear of the last trailer and listen for air flow. The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. When doing a walkaround inspection of a double or triple trailer, the shut-off valves should be _______ at the rear(s) of the front trailer(s) and ________ at the rear of the last trailer. What is a converter dolly? | Samsara A. What happens if you cross the Emergency Air Line and the Service Air Line? With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Page 1 - Doubles/Triples Test Study Guide for the CDL If one air system is very low on pressure _______. Then, the air loss from the leak will lower the air tank pressure quickly. Disconnect the glad-hand at the front of the first trailer and listen for air flow. the converter dolly air tank drain valve on couple double/triple trailers should be: to check if the converter dolly is securely coupled to the rear trailer you should: pull gently against the pin of the second trailer. Each tank has a drain valve on it, and you should drain each tank every day. What is a converter dolly? If there is a trailer If the air supply in the trailer air tank has leaked away, there will be no emergency brakes, and the trailer wheels will turn freely. door. When driving a double or triple trailer, greater care must be given to. 0000006015 00000 n Why should you not use the trailer hand valve while driving? Compressed air usually has some water and some compressor oil in it. Should I Be A Truck Driver? While doing a walkaround inspection of a double or triple, the converter dolly air tank drain valve should be _____, and the pintle hook should be _____. you want to hook your combination to a second trailer that has no spring brakes. A dolly has lights, air tanks, air relays, air lines, air brakes, ABS, electrical connections, etc. At section 2 downstream, the speed is 519 m/s. You should be sure the converter dolly air tank drain valves are _______ and the pintle hook is _____. How can you test that air flows to all trailers? Air Storage and Drain Tanks: Air storage tanks are used to hold compressed air. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. Which is most likely to tip over: which of these is not a good thing to do when driving on slippery roads? B. releasing the pintle hook A. use the engine brake or speed retarder Be sure pintle-eye of dolly is in place in pintle hook of trailer(s). All other trailer air functions use the emergency line. Doubles/triples flip flop over from quick steering moves more easily than many vehicles. what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? The total number of questions. The topics with which you will want to be expertly familiar are: There isnt as much information to be studied in the classroom or in the CDL manual regarding doubles and triples, so in-lot and on-the-road practice will help you pass this test. When testing the coupling of the double trailer the landing gears of the rear trailer should be: You want to hook your combination to a second trailer that has no spring brakes. The Doubles and Triples written CDL Exam is required for your doubles and triples endorsement. You are driving a 100 foot twin trailer combination at 50 mph. What happens when there is a major leak in the emergency air line? When pulling a single trailer with a Shut-Off Valve, the valves must be in the: Trailers built before what year may not be equipped with trailer spring brakes? will have a lamp on the drivers side. Double and Triples Endorsement Flashcards The shut off valves prevent air from going any further. Correct answer percentage. When turning a double or triple at an intersection, the turn often cannot be completed without swinging wide. You are doing a walkaround inspection of a double or triple trailer rig. The emergency line valve open and release air The road is dry and visibility is good. The number and size of air tanks varies among vehicles. Finsbury Pump Systems 400l (Single Stage) 5.5hp Honda Gx Petrol Engine Make sure to visually inspect the fifth wheel and that the locking mechanism is . Explore now! At section 1, where the cross-sectional area is 0.02 m2m^{2}m2, the air is at 40.0 kPa (abs), 60C60^{\circ} \mathrm{C}60C, and M=2.0. A. make things look smaller and farther away than they really are Leave a Reply Cancel reply - Free CDL Practice Tests 2022 You should be sure the converter dolly air tank . We are an independent company focused on providing valuable motor vehicle and permit practice test information. You should hear air escaping, showing the entire system is charged. Open Trailer Air Tanks And Shutoff Valves - Page 50. You must check that all shut-off valves are in the open position except the ones at the back of the last trailer, which must be closed. Each trailer and converter dolly has one or more air tanks. when does the drivers manual say you should disable the steering axle brakes? When checking the fifth wheel, you should make sure that it has enough? A. fully lowered 0000009556 00000 n B. slightly raised Study section 6.2 if you can't answer all of these questions. Related Question Question: What does this sign mean? 0000010705 00000 n On a triple combination, the shutoff valves at the rear off the middle trailer should be? To check that the trailer emergency brakes are working properly, you should pull out the trailer air supply control and? A. the total stopping distance of a truck is the distance it takes to stop once the brakes are put on at any speed locked . A full trailer behind a truck B Which of the following statements about off tracking is true? The service air line is only used to control the service brakes (when you press on the brake pedal or use the trailer hand-valve). A-dolly. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. It is very important to keep the air supply clean. If the converter dolly is close to your semitrailer, you should wheel it into position? rear brakes will not work properly. When inspecting doubles and triples you must make sure there is air all the way to the back of the last trailer, otherwise what may not work? A. open the shut-off valves at the rear of both trailers 0000007487 00000 n How should you test the coupling? 3. True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. B. you need about four times as much stopping distance at 40 mph as at 20 mph In bad weather, slippery conditions and mountain driving, you must be especially careful if you drive double and triple bottoms. The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. which of these statements about managing space to the sides is true? In an application in which vGS=vDS=Vsupply=1.8V,v_{G S}=v_{D S}=V_{\text { supply }}=1.8 \mathrm{V},vGS=vDS=Vsupply=1.8V, a drain current of 2 mA is required of a device of minimum length of 0.18m.0.18 \mu \mathrm{m}.0.18m. If this activity does not load, try refreshing your browser. The DMV doubles triples practice test will examine your knowledge of pulling double/triple trailers, coupling and uncoupling, inspecting doubles and triples, and checking air brakes. You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. 0000006836 00000 n 2003-2023 Chegg Inc. All rights reserved. 4. Florida CDL Handbook | FL CDL Handbook Coupling & Uncoupling for NPT thumbscrew style design enables easy installation. Lock pintle hook. The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). 0000010285 00000 n Simply click in your answer to each CDL practice test question. 0000010783 00000 n C. make things look larger and closer to you than they really are, When hauling triple trailers at a speed less than 40 mph, you should leave at least _____ second(s) for every ten feet of your truck between you and the vehicles ahead of you. 0000005345 00000 n Safety fail-safe features of a tractor-trailer converter dolly. The A-dolly has a single drawbar with a single, centered hitching point. CDL Doubles & Triples Practice Test 3 - Classic Mode - Trucker Country A dolly is like a very short trailer, with a ring hitch on the front and a fifth wheel on top. If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. Pull gently against the pin of the second trailer. The last trailer in a combination is most likely to turn over. That there is some space between the upper and lower fifth wheel. On double and triple combinations, you must make sure that which of these is secure? Some areas of concern are discussed below. Shut off valves are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). You are driving a 100-feet truck with double trailers at 50 mph. When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. Open, free C. slow to a safe speed before entering the curve, then coast through it, Which of these is NOT a good thing to do when driving on slippery roads? 0000003261 00000 n to re-capture it. you are driving a 100ft truck eith double trailers at 50mph. your vehicle is so long that you must swing wide to make a turn. Dobles - Triples Pruebas de prctica 3 - NJ 2023 - CristCDL.com It is extremely unlikely you will drive a trailer built before 1975, but for the written exam, you still may need to know that trailers built before 1975 were not required to have spring brakes. Sketch the shape of the passage between sections 1 and 2. Clean the couplers and rubber seals before a connection is made. utilize the brakes. This has the same value as the %%SCORE%% Variable on the Final Screen. B You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. ), a 15 year truck driving veteran, in January 2007. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. Light cords firmly in sockets on trailer. C. engaging the tractor valve protection control, You must drive through deep or flowing water. You must steer gently when pulling trailers. The best way to keep brakes from getting to hot while going down long grades is to: Go slow and use only light, steady pressure on the brakes. Page 7-6 Commercial Driver's Manual/2.0 = Be sure air lines are supported and glad hands are properly connected. The air lines will rupture We've all wondered if the adventure and challenges of life on the open road would suit us better than the ordinary day to day lives we've always known. None of the above, 4. You should NOT: Types of converter dollies. Delivering to. 0000005733 00000 n While it is general practice to make blue the service line, red the emergency line, and green the electrical line, these colors are not required by any laws or regulations. Doubles Triples Endorsement Test Flashcards | Quizlet PDF Section 7: Doubles and Triples - CDL Study A The road is dry and the visibility is good. B. open the shut-off valves at the rear of the first trailer and close the shut-off valves at the rear of the second trailer You are doing a walk around inspection of a double or triple trailer rig. 2023 WV Doubles - Triples CDL Practice Test 1 - CristCDL.com How can you test that air flows to all trailers? Do converter dollies have spring brakes? Ensuring the safety of the public starts with a thorough inspection of all equipment. You will speak with recruiters today. You must treat a flashing red signal as you would treat a STOP sign. Converter dollies have spring brakes. Double and Triples Part 1 Flashcards - flashcardmachine.com B. slow to a safe speed before entering the curve, then accelerate slightly through it
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